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Pointers REFERENCE - ISO:C90-6.3.6 Additive Operators - Constraints

An addition or subtraction operation is being performed on an expression of pointer type.

Message 0488 is generated when 2 pointers are subtracted or when an integer value is added or subtracted from a pointer value. An exception to this rule occurs when the integer value 1 is added or subtracted fron a pointer; in this particular case, message 0489 is generated instead.

For example: 


/*PRQA S 510,2017,3120,3199,3203,3408,3447 ++*/

extern int *px;
extern int *qx;

extern void foo(void)
{
    long s;

    px = px + 2;                /* Message 0488 */
    s = qx - px;                /* Message 0488 */

    px = px + 1;                /* Message 0489 */
    ++px;                       /* Message 0489 */
    qx--;                       /* Message 0489 */

}

See also:

QA·C Source Code Analyser 8.1.2
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